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      1 /*
      2  * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved.
      3  * Copyright (C) 2009 Google Inc. All Rights Reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  *
     26  */
     27 
     28 #include "config.h"
     29 #include "core/workers/Worker.h"
     30 
     31 #include "bindings/core/v8/ExceptionState.h"
     32 #include "core/dom/Document.h"
     33 #include "core/events/MessageEvent.h"
     34 #include "core/fetch/ResourceFetcher.h"
     35 #include "core/inspector/InspectorInstrumentation.h"
     36 #include "core/frame/LocalDOMWindow.h"
     37 #include "core/frame/UseCounter.h"
     38 #include "core/workers/WorkerGlobalScopeProxy.h"
     39 #include "core/workers/WorkerGlobalScopeProxyProvider.h"
     40 #include "core/workers/WorkerScriptLoader.h"
     41 #include "core/workers/WorkerThread.h"
     42 #include "wtf/MainThread.h"
     43 
     44 namespace blink {
     45 
     46 inline Worker::Worker(ExecutionContext* context)
     47     : AbstractWorker(context)
     48     , m_contextProxy(0)
     49 {
     50 }
     51 
     52 PassRefPtrWillBeRawPtr<Worker> Worker::create(ExecutionContext* context, const String& url, ExceptionState& exceptionState)
     53 {
     54     ASSERT(isMainThread());
     55     Document* document = toDocument(context);
     56     UseCounter::count(context, UseCounter::WorkerStart);
     57     if (!document->page()) {
     58         exceptionState.throwDOMException(InvalidAccessError, "The context provided is invalid.");
     59         return nullptr;
     60     }
     61     WorkerGlobalScopeProxyProvider* proxyProvider = WorkerGlobalScopeProxyProvider::from(*document->page());
     62     ASSERT(proxyProvider);
     63 
     64     RefPtrWillBeRawPtr<Worker> worker = adoptRefWillBeNoop(new Worker(context));
     65 
     66     worker->suspendIfNeeded();
     67 
     68     KURL scriptURL = worker->resolveURL(url, exceptionState);
     69     if (scriptURL.isEmpty())
     70         return nullptr;
     71 
     72     worker->m_scriptLoader = WorkerScriptLoader::create();
     73     worker->m_scriptLoader->loadAsynchronously(*context, scriptURL, DenyCrossOriginRequests, worker.get());
     74     worker->m_contextProxy = proxyProvider->createWorkerGlobalScopeProxy(worker.get());
     75     return worker.release();
     76 }
     77 
     78 Worker::~Worker()
     79 {
     80     ASSERT(isMainThread());
     81     if (!m_contextProxy)
     82         return;
     83     ASSERT(executionContext()); // The context is protected by worker context proxy, so it cannot be destroyed while a Worker exists.
     84     m_contextProxy->workerObjectDestroyed();
     85 }
     86 
     87 const AtomicString& Worker::interfaceName() const
     88 {
     89     return EventTargetNames::Worker;
     90 }
     91 
     92 void Worker::postMessage(ExecutionContext*, PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionState& exceptionState)
     93 {
     94     ASSERT(m_contextProxy);
     95     // Disentangle the port in preparation for sending it to the remote context.
     96     OwnPtr<MessagePortChannelArray> channels = MessagePort::disentanglePorts(ports, exceptionState);
     97     if (exceptionState.hadException())
     98         return;
     99     m_contextProxy->postMessageToWorkerGlobalScope(message, channels.release());
    100 }
    101 
    102 void Worker::terminate()
    103 {
    104     if (m_contextProxy)
    105         m_contextProxy->terminateWorkerGlobalScope();
    106 }
    107 
    108 void Worker::stop()
    109 {
    110     terminate();
    111 }
    112 
    113 bool Worker::hasPendingActivity() const
    114 {
    115     // The worker context does not exist while loading, so we must ensure that the worker object is not collected, nor are its event listeners.
    116     return (m_contextProxy && m_contextProxy->hasPendingActivity()) || m_scriptLoader;
    117 }
    118 
    119 void Worker::didReceiveResponse(unsigned long identifier, const ResourceResponse&)
    120 {
    121     InspectorInstrumentation::didReceiveScriptResponse(executionContext(), identifier);
    122 }
    123 
    124 void Worker::notifyFinished()
    125 {
    126     if (m_scriptLoader->failed()) {
    127         dispatchEvent(Event::createCancelable(EventTypeNames::error));
    128     } else {
    129         ASSERT(m_contextProxy);
    130         WorkerThreadStartMode startMode = DontPauseWorkerGlobalScopeOnStart;
    131         if (InspectorInstrumentation::shouldPauseDedicatedWorkerOnStart(executionContext()))
    132             startMode = PauseWorkerGlobalScopeOnStart;
    133         m_contextProxy->startWorkerGlobalScope(m_scriptLoader->url(), executionContext()->userAgent(m_scriptLoader->url()), m_scriptLoader->script(), startMode);
    134         InspectorInstrumentation::scriptImported(executionContext(), m_scriptLoader->identifier(), m_scriptLoader->script());
    135     }
    136     m_scriptLoader = nullptr;
    137 }
    138 
    139 void Worker::trace(Visitor* visitor)
    140 {
    141     AbstractWorker::trace(visitor);
    142 }
    143 
    144 } // namespace blink
    145